Title

Terahertz Wave Emission from Intrinsic Josephson Junctions in High- TC Superconductors

Abstract

Recently, we experimentally demonstrated that rectangular mesa structures of intrinsic Josephson junctions (IJJ) in Bi2Sr2CaCu 2O8+d (Bi2212) can be used as a compact solid-state generator of continuous, coherent and polarized terahertz (THz) radiation. In the present work, we will exhibit tall mesas (over 600 junctions) which were fabricated using UV lithography, e-beam lithography with photoresist and e-beam lithography with a Ti selective etching technique. We will present measurements of the c-axis resistance as a function of temperature and of current-voltage characteristics of THz emitting mesas with lateral sizes ranging from 30 x 300 to 100 x 300νm2. Furthermore, we will discuss the dependence of the characteristics of the mesa structures on the oxygen doping level of the Bi2212 crystals. We will also experimentally show that the voltage-frequency relation of the ac Josephson effect has to match the cavity resonance for successful emission.

Department(s)

Physics

Second Department

Geosciences and Geological and Petroleum Engineering

Keywords and Phrases

Ac Josephson effect; Bi-2212; Cavity resonances; e-Beam lithography; High-T; Intrinsic Josephson junction; Lateral sizes; Mesa structure; Oxygen doping; Selective etching; Solid-state generator; Terahertz radiation; Terahertz waves; UV lithography; Electron beam lithography; Josephson junction devices; Current voltage characteristics

International Standard Serial Number (ISSN)

0953-2048

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2009 IOP Publishing Ltd., All rights reserved.

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